User List process modified.

.../src/de/fu_berlin/inf/dpp/test/ActivitySequencerTest.java

...de/fu_berlin/inf/dpp/test/net/RequestTransmitterTest.java

.../de/fu_berlin/inf/dpp/test/net/UserListExtensionTest.java

de.fu_berlin.inf.dpp/src/de/fu_berlin/inf/dpp/User.java

...pp/concurrent/jupiter/internal/JupiterDocumentServer.java

...erlin/inf/dpp/concurrent/jupiter/internal/Serializer.java

.../de/fu_berlin/inf/dpp/net/internal/ActivitySequencer.java

...c/de/fu_berlin/inf/dpp/net/internal/PacketExtensions.java

...e/fu_berlin/inf/dpp/net/internal/XMPPChatTransmitter.java

....dpp/src/de/fu_berlin/inf/dpp/project/ISharedProject.java

.../de/fu_berlin/inf/dpp/project/ISharedProjectListener.java

.../de/fu_berlin/inf/dpp/project/internal/SharedProject.java

...rlin.inf.dpp/src/de/fu_berlin/inf/dpp/ui/SessionView.java

...de/fu_berlin/inf/dpp/ui/actions/GiveDriverRoleAction.java